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          <th colspan="3" align="center">Non-standard Spectral Processing</th>
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            <h2 class="title" style="clear: both"><a id="SpectralNonstand"></a>Non-standard Spectral Processing</h2>
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    These units generate and process non-standard signal data types, such as down-sampled time-domain control
signals and audio signals, and their frequency-domain (spectral) representations. The data types (<span class="emphasis"><em>d</em></span>-, <span class="emphasis"><em>w</em></span>-) are self-defining, and the contents are not processable by any other Csound units. These unit generators are experimental, and subject to change between releases, they will also be joined by others later.
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    The opcodes for non-standard spectral processing are
    <a class="link" href="specaddm.html" title="specaddm"><em class="citetitle">specaddm</em></a>,
    <a class="link" href="specdiff.html" title="specdiff"><em class="citetitle">specdiff</em></a>,
    <a class="link" href="specdisp.html" title="specdisp"><em class="citetitle">specdisp</em></a>,
    <a class="link" href="specfilt.html" title="specfilt"><em class="citetitle">specfilt</em></a>,
    <a class="link" href="spechist.html" title="spechist"><em class="citetitle">spechist</em></a>,
    <a class="link" href="specptrk.html" title="specptrk"><em class="citetitle">specptrk</em></a>,
    <a class="link" href="specscal.html" title="specscal"><em class="citetitle">specscal</em></a>,
    <a class="link" href="specsum.html" title="specsum"><em class="citetitle">specsum</em></a>, and
    <a class="link" href="spectrum.html" title="spectrum"><em class="citetitle">spectrum</em></a>.
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